He used court actions to break up business monopolies
Explanation:
In the late-nineteenth century, many big businesses, like the Standard Oil, had either bought established business arrangements, or even bought their rivals, in order to effectively destroy the competition. Many companies followed the model used by Standard Oil, since they were organizing themselves as a trust in which many component corporations were controlled by a single board of directors. Roosevelt did not see all trusts as bad, but did his best to regulate all of those that he saw as bad.
A special session (also extraordinary session) is a period when the body convenes outside of the normal legislative session. In other cases, special session may be convened to address special topics, or emergencies such as war or natural disaster.